53 lines
1.6 KiB
C++
53 lines
1.6 KiB
C++
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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/process/process_handle.h"
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#include <windows.h>
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#include <tlhelp32.h>
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#include "base/win/scoped_handle.h"
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#include "base/win/windows_version.h"
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namespace base {
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ProcessId GetCurrentProcId() {
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return ::GetCurrentProcessId();
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}
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ProcessHandle GetCurrentProcessHandle() {
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return ::GetCurrentProcess();
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}
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ProcessId GetProcId(ProcessHandle process) {
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if (process == base::kNullProcessHandle)
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return 0;
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// This returns 0 if we have insufficient rights to query the process handle.
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// Invalid handles or non-process handles will cause a hard failure.
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ProcessId result = GetProcessId(process);
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CHECK(result != 0 || GetLastError() != ERROR_INVALID_HANDLE)
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<< "process handle = " << process;
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return result;
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}
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ProcessId GetParentProcessId(ProcessHandle process) {
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ProcessId child_pid = GetProcId(process);
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PROCESSENTRY32 process_entry;
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process_entry.dwSize = sizeof(PROCESSENTRY32);
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win::ScopedHandle snapshot(CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0));
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if (snapshot.IsValid() && Process32First(snapshot.Get(), &process_entry)) {
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do {
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if (process_entry.th32ProcessID == child_pid)
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return process_entry.th32ParentProcessID;
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} while (Process32Next(snapshot.Get(), &process_entry));
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}
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// TODO(zijiehe): To match other platforms, -1 (UINT32_MAX) should be returned
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// if |child_id| cannot be found in the |snapshot|.
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return 0u;
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}
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} // namespace base
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